是否可以使用 JS 检查哪个浏览器支持哪个 video/audio `codec`?

Is it possible to check which video/audio `codec` supported by which browser using JS?

更准确地说,我想检查我可以在浏览器中为 HTML5 中的 video/audio 元素使用哪些编解码器。 (例如 Safari 支持 H.264,但我也想知道我可以使用哪些编解码器)

由于规范随时间变化,我想以某种方式自动执行,而不是基于浏览器编解码器表。

我觉得,在JS里可以写成一个函数(如果还没写的话)。我已经尝试 Google 它,但还没有找到答案。

参考link:https://www.nomensa.com/blog/2011/detecting-browser-compatibility-html5-video-and-audio 你可以这样做:

// Define the get_mime function
var get_mime = function(filetype) {
  var mimetype = '';
  var media_container = 'video';
  switch (filetype) {
    case 'mp4':
      mimetype = 'video/mp4; codecs="avc1.42E01E, mp4a.40.2"';
      break;
    case 'ogg':
      mimetype = 'video/ogg; codecs="theora, vorbis"';
      break;
    case 'webm':
      mimetype = 'video/webm; codecs="vp8, vorbis"';
      break;
    case 'mp3':
      mimetype = 'audio/mpeg';
      media_container = 'audio';
      break;
  }
  return {
    'mimetype': mimetype,
    'container': media_container
  };
};

// Check to see if the browser can render the file type
// using HTML5
var supports_media = function(mimetype, container) {
  var elem = document.createElement(container);
  if (typeof elem.canPlayType == ‘ function’) {
    var playable = elem.canPlayType(mimetype);
    if ((playable.toLowerCase() == 'maybe') || (playable.toLowerCase() == 'probably')) {
      return true;
    }
  }
  return false;
};

// When the DOM has loaded check the file extension of each media link
// and serve up appropriate media player
$(document).ready(function() {
  $(‘a.youtube - links’).each(function() {
    var path = $(this).attr(‘href’);
    var extension = path.substring(path.lastIndexOf('.') + 1);
    var extension_info = get_mime(extension);
    if (supports_media(extension_info.mimetype, extension_info.container)) {
      // Serve up an HTML5 Media Player and controls
      serve_html5();
    } else {
      // Serve up a flash based video for browsers that
      //will not play the file using HTML5
      serve_flash();
    }
  });
});